Im wondering if there is any difference between the reading patterns (Z and Layered-cake) since both of them require the user to read rtl or ltr whilest moving down a notch when going to the next line to scan for information.
The Z usually shows a classic example of a page with a big hero-image which is skipped by the diagonal line of the Z.
The layered-cake appears to be more about Headings / banners that would all be scanned.
I am unsure if they are both the same, or if they should follow eachother up. E.g. you start the page scanning in Z-pattern, continue in Layered Cake after youve passed the hero-image.